I just ordered a bunch of limiteds from Kardwell.
I also found black backed Bikes in a 4 pck - 2 red, 2 black. The faces are standard. Didnt even know they were black, just picked up cards to trash for practice. Handling them, I said to myself these look like a really dark blue. Reading the box they say Exclusive Black Decks. They were 9.00 for a 4 pk with 3.00 mail in rebate. I picked them up at a Rite Aid drug store.
I tried to find them online, sold as individual packs, to no avail. I picked up another 4 pack just to have a few extras.
Happy hunting.